Shared Calendars integrates schedules across your office or organization. It allows many users to each create their own individual calendars, giving access to different people as desired. They can create a calendar just for themselves, or for a committee or workgroup.

Fugit is a perl calendar script for time management of a group of staff. You can see at a glance where your staff are on a certain day, or look at absence trends. You can allow staff to see their own training records, for example. The professional version provides a complete and graphical analysis of all staff.

uReserve is an online resource scheduling system that allows members in your
organization to share and reserve any type of resource such as conference
rooms, computer systems, electronic equipment, and more!

Virtual Mysql Calendar is a calendar program allowing multiple users to organize their lives. Users can add events to a calendar that starts in the early 1900's. The admin section is simple, but effective, it allows you to setup the mysql database eliminating a big hastle of trying to enter it manualy and an option which lists all of the users and their passwords. With these, you can enter any users calendar and modify/delete events or even the entire user. The colors and styling of the dynamicly generated webpage is completely customizable and can be changed to meet your websites needs.

VisualCalendar is a fully-featured web-based calendar application that integrates event scheduling, tasks, journals/diary, bookmarks and notes support in one unified platform. VisualCalendar answers to the needs of mobile workers, remote sites and all forms of corporate mobility as well as service providers. This solution includes tools able to optimize collaborators efficiency and to improve their exchanges with their colleagues, customers or partners. VisualCalendar is a highly scalable and robust calendaring platform designed to support millions of users while delivering the industry's best performance and availability.
VisualCalendar is the most powerful enterprise-wide scheduling and collaboration solution available with an user-friendly interface that enables users to store schedules, appointments, task lists, journals, notes and bookmark information, all in one location, accessible from multiple devices, anywhere in the world. Additionally, VisualCalendar provides collaboration functionalities for workgroups, including calendar sharing, meeting invitations and tracking, task assignments, task status reports and journal exchange using the iCalendar standard.